Hrm... I haven't done it myself, but I've always been curious as to how the MA70 climate control unit would work in an ST165... I don't know all that much about wiring isues or anything like that, but I'd assume it'd be similar to the Celica's unit. If I find an MA70 around, I'll try ripping the system out and taking a closer look, but until then.... guress I'm out in the cold on knowing if it's a possibility or not.